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Q:

Atomic number of which of the following elements is greater than that of Magnesium

A) Neon B) Fluorine
C) Sodium D) Aluminium
 
Answer & Explanation Answer: D) Aluminium

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Q:

Which of the following is usually not an air­pollutant?

A) Hydrocarbons B) Sulphur dioxide
C) Carbon dioxide D) Nitrous oxide
 
Answer & Explanation Answer: D) Nitrous oxide

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Q:

Which is the most economical method of removing solid matter from water?

A) Using deactivated carbon B) Electrolysis
C) Distillation D) Sedimentation
 
Answer & Explanation Answer: D) Sedimentation

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Q:

What is dehydration?

A) Removal of acid from a molecule B) Removal of base from a molecule
C) Removal of water from a molecule D) Removal of alkali from a molecule
 
Answer & Explanation Answer: C) Removal of water from a molecule

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Q:

Which of the following elements has the lowest melting point?

A) Tin B) Hydrogen
C) Carbon D) Sodium
 
Answer & Explanation Answer: B) Hydrogen

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Q:

Pyrolusite is an ore/mineral of ___________.

A) Mercury B) Manganese
C) Molybdenum D) Lead
 
Answer & Explanation Answer: B) Manganese

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Q:

Acetic Acid is another name for which of the following?

A) Vinegar B) Baking Soda
C) Copper Sulphate D) Magnesium Oxide
 
Answer & Explanation Answer: A) Vinegar

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Q:

What is the pH of water?

A) 7 B) 5
C) 3 D) 1
 
Answer & Explanation Answer: A) 7

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